Europe, Africa and most of Asia use 50-hertz power, while much of the Americas uses 60 hertz. The split dates back to choices by early manufacturers in the late 19th century: 50 Hz for Germany's AEG, 60 Hz for America's Westinghouse. In Japan, the east and west imported German and American generators respectively, and still live with both frequencies today.
In 1843, inventor Alexander Bain patented a way to send images over telegraph wires using synchronized pendulums. By the 1860s, a commercial fax service was already linking cities. The telephone wasn't patented until 1876, more than three decades after that first fax patent. The fax is really a child of the telegraph age.
On 8 October 1958, in Stockholm, 43-year-old Arne Larsson received the very first implanted pacemaker. The device, designed by engineer Rune Elmqvist and implanted by surgeon Åke Senning, worked for only a few hours and had to be replaced. Larsson went on to receive more than twenty pacemakers in his lifetime. He died in 2001 aged 86, outliving both the engineer and the surgeon.